Machine tool



9, 1945. c. A. wlKEN ET Al.

MACHINE TOOL 6 Sheets-Sheet 2 Filed Dec. l, 1942 oet 9, 1945- c. A.wlKl-:N ETAL 2,386,283

MACHINE TOOL 1Filed Dec. 1, 1942 s sheets-@haai s` je Z ||||l||||||llIIIIL Get. 9, 1945.

C. A. WIKEN ET Al. 2,386,283

MACHINE TOOL Filed Dec. 1, 1942 6 Sheets-Sheet 4 -l L a W@ 0 /0/ #MM/wWL M E y Oct. 9, 1945v C. A. WIKEN ET AL MACHINE TOOL Filed Dec. l, 19426 Sheets-Sheet 5 UCL 9, 1945. C. A W|KEN ET AL 2,386,283

MACHINE Too;

Filed Dec. 11942 6 Sheets-Sheet 6 :Pennies oei. s, 194s l UNITED STATE18 Claims.

This invention relates to machine tools, and more particularly togrinding machines of the character known in the art as surface grinders.although it is not limited to such use.

The surface grinders now in use are extremely expensive because of thecomplicated and diiilcult machining operations required to produce theaccurate supports and guideways for the movable tables and the verticalcolumn and slide for supporting the wheel and motor assembly. 'I'hesecomplicated and expensive machining operations are eliminated by thesimple construction of the present invention which enables a surfacegrinder to be built up of simple castings and standard commercial stock,requiring simple surface grind ing of the intertting guides and otherparts. To this end, the guides and racks for the movable temes and thevertieai siide adapted te supportJ the grinding wheel. its spindle andthe motor,-l

are formed from commercial cold rolled steel stock and slidablycooperate with surfaces which can be accurately formed by simple surfacegrinding and simple milling operations to obtain the required accuracy.

Accordingly the primary object of the present invention is to provide agrinder for accurate work utilizing standard stock and avoiding`,expensive machining and hand fitting of the working parts. and yetenabling-` turned out. I y

It is a further important. object to provide a novel mounting andsupport assembly for the spindle of a grinding wheel which-'reduces sideand endplay to a minimum.' assuringl accurate and true rotation of thegrinding wheel throughout the life of the' machine.

Another object of this invention is to provide a grinder having apivotally mounted frame for supporting the grinding wheel spindle, with'a micrometer adjustment in which the pivotal axis of the frame'is solocated 4with respectito the mi crometexadjustment that actuation of themihighly accurate work to be s PATENT oEEicE MACHINE Tool. y

christy A; wiken and Erie A. Reinig, Milwaukee,

Wis., assignors, by mesne assignments, to The Delta ManufacturingCompany, Milwaukee, Wis., a corporation of Wisconsin Applicationneeemberi, 1942, serialize. 467,512

y(ci. 51-93) means for securing the crometer adjustment a predetermined"amount actuates the spindle an exactly equal amountiwith a minimum ofsliding, insuring vibrationfree operation. Still another object of andfeed tables of a grinder o1- the like.

Alfurtherlobiect is to provide a novel column" structure for mountingthe motor, spindle and cutting tool for accurate controlled slidingmovement along the column.

this invention is to `pro vide a novel slide arrangement for thetraversing i tion of the arr `ws.

tool on the work table of a grinder` in position to dress eitherconventional surface grinding whee or cup wheels. l i The-inventionfurther aims to provide adclitional subordinate grinding machineimprove` ments; including novel feeding metiliii.iii.smsgol' thetraversing and feedingy tables;\ impro ed cglumn to the mac i base,permitting adjustme t of the col `n abo its axis to locate the wheel outof para el wit the direction'of feed of the work; improvedwvheel andmotor guard assemblies; and other improve# f metnts and refinementsto'be hereinafter pointed ou Further objects will appear from the foliog description and appended claims .whedgread conjunction with theattached dra ings wherein'. Figure 1 is apictorial View ofthdngrinderxof the\\ i present invention. f' g 1 Y Figure 2 is a planview of the griri'dei`- of Figure 1 with certain parts in section orBroken -`awaya1id the cover for the motor\removed. j 7\ Figure ,3 is afront elevational viw of the grinder of I'Figure `IWithy thecoveriormotor and the hand wheels `for operating he table removed.4 f,\ M iFigure iis a sectional view taken .substantially online 4 4 of Figure 3wlth` the work suppo ng tablel moved toward its extreme right-hand si,-

tion in Figure 3 and the section line passing tnnfiiigh theleft-hend-endei the werk supper-iin i i surace.

, i ig i', l Figure 51S i enlargel Xp10d\d view ofi the v slide memberand itsl asso iatedYpartsm I f Figure 6 is an enlarged fragmentalviewshowing thel relationshipbetween the pivotal axis of the motor andspindle supporting framand the micrometer adjustment carriedby the slidemein-l i T is enenierged sectional view ii usi-ret# ting in the motodahdspindle supporting frame. I Figre 8 isa sectional view takensubstantially on he line B- of Figure 'l looking in the direction of thearrows, i

` Figure' 9 is a sectional view taken substantially on the line 9--8 `ofFigure/'l lookingin thedirec- Figure 10 is a enlarged detailed viewillustrate ing the i.shaped bracket provided for supporting thetraversing screwi of the traversing table in offset relation to :theopen slot provided in the traversingftable. i

a. v Figure 11.is "ad enlarged exploded view ofithe traversing table andits associated parts.

. parable capacity and accuracy.

Figure 12 is an e ged detailed fragmental sectional view showing .themanner in which the traversing screw is journalled in the wall of thebase of the grinder.

Figure 13 is an enlarged ing in detail the manner in which the feedscrew of the feed or work table is mounted in the traversing table andthe feed and'slidev mechanism for the feed or work table.

ness at any point. As a consequence, base A is o stiff enough to permitlegs 22 to stand on a rather view showuneven iloor without distortion orharmfully affecting operation of the tables B and C, column 'D or thequality of grinding.

Portion 26 of top 23 is also provided with a slot 33 having a notch 34along one side approx- Figure 14 is a fragmental view illustrating lthe10 imateLv midway between its ends and front wall novel dressing tooland holder of the-:present invention mounted on the work table inposition for dressing a surface wheel which is shown in its properrelation to the dressing tool and the work table; and

Figure 15 is a top plan view of the base of the grinder illustrated inFigures 1 to 14.

With continued reference to the drawing( wherein like reference numeralsare used to des- 2l is provided with an aperture 35 in a plane oil'setfrom theaxis of slot 33. The purpose of `slot 33, notch 34 and aperture35 will presently appear as the description proceeds.

Lands 21 and 28 are accurately machined to v provide longitudinallyextending, horizontal slides 3l in a common plane for supporting table Bfor. traversing movement in a horizontal plane across base A toward andaway from annular ignate the same parts throughout the severalgo land25. .The vertically extending wall 31 of a grinder in which they areparticularlyuseful.

The grinder comprises a novel base A, a traversing table or cross slideB, a work-supporting table or top slide C, a column D, a slide member orcolumn sleeve E mounted for sliding movement on column D, and a combinedmotor supporting and spindle housing frame F. While these varguideway 32is accurately machined to provide a guiding surface normal to the planecontaining slides 35 and normal to a plane passing through the axisfofbore 3i at right angles to yside walls 24. Land 25 is also machined toprovide a surface 35 lying-inthe plane containing slides 36. The'remainder of base A is left in its original cast state since themachined surfaces referred to above are the critical surfaces. It isobvious ious elements are in general well known in the that themachining operations required on base machine tool art. they are formedand assembled in a novel manner by the present invention to produce animproved machine which can be built at minimum cost from.- readilyavailable A are simple, inexpensive operations and that a minimum amountof machining is required because of the relatively small areas of themachined surfaces. A gib 38 is disposed in guideway commercial stockwhile eliminating complicated 22 and is adapted to be forced toward wall31 by and expensive machining operations and hand fitting now requiredto produce grinders of com Heretofore this type of machine has beenbuilt in rather small lots in both foundry and machine shops, resulti0ing in higher costs, due to greater handling and setting up, forproducing the parts. The present invention makes it possible to tool upin both the foundry and machine shop to produce these machines in largerquantities, with 1allparts 45 interchangeable.

ent invention provides a basic surface grindin In this connection, 'thepresmachine which may be used for special operations, now requiringseveral machines or extremely expensive machines, merely thrgugh the 50use of relatively inexpensive attachments, not claimed in thisapplication, capable of being readily secured to the work-supportingtable: While the grinder may be secured to any suitable supl,studs 40for a purpose to be presently pointed out.

Table B is designed tov rest on slides 25 and be guided for movementalong said slides by a novel guide cmstruction cooperating with wall 21of guideway 32. To this end the body portion 4i of table B has dependinglands 42 at its ends designed to slidingly contact slides 33. Lands 42are normal to the longitudinal axis of body 4i and their under surfacesare accurately machined to provide slidesr in a common plane for slidingco- `operation with slides 35 -of base A. The land 42 cooperating withland 21 of base A has a guide bar 43 removably secured to it by means ofscrews 44 the heads `of which are counter-bored into the bar 43. :Bar 43is madeof cold rolled steel stock and is secured to land 42 in such amanner that its vertical sides 45 and 43 are normal to the longitudinalaxis of body portion 4I. & clearly port such as s. table or the likethrough the use ss shown in Figure 1 and Figure 3 guide bar 43 is ofthe'k bolting-down pads 2i (Figure 15) of base A, aset of supportinglegs 22 shown in part in Figures 1, 3 and 4 is preferably provided.

Base A is a casting made of regular gray ironl disposed in guideway 32with its vertical wall 45 in contact wtlh'vertical wall 31 of guideway32. Gib 25 in guideway 32 is forced against wall 45 of guide bar 43 bymeans of studs 4I until walls 4I and need not be annealed beforemachining. ,as so and 31 are in full but sliding contact from end thedesign thereof largely eliminates strains. as clearly seen in Figures i,4 and l5, baseA-isdee'p and has a top wall 23, side walls 24,'frontand., rear walls 25 and an open bottom. Portion 25 Vto end. Lock nuts 41on studs 4l are then tightened to secure guide bar 43 in its adjustedposition against wall 31 and tableB is constrained to move toward andaway from land 20 in a of top wall 23 is raised slightly and is providedes path determined by wall 31 and in a plane deterwith upstandinglongitudinally extending lands V21 and 23 and an annular land 23. Asclearly seen in Figure 15, land 23 is located beyond one end of lands 21and 22 adjacent rear wall 25 mined by slides 33 and the slides providedby depending lands 42 of table B. lThese slides are covered andprotected in all positions of table B by extensions or aprons 43 castintegral with body and is provided with an annular bore 2i. Land 'l0 4|and lands 42.

21 is provided with a guideway 32 and the under'- side of top 23 belowland 23'is provided with an annular, downwardly extending boss 3lcontaining a continuation of bore 3i terminating in an enlargedconcentric portion. Ribs 32a diverge 15 journal bearing 5l having anannular flange 52 at its outer end. Flange 52 abuts the outer face ofwall Il and is held against axial movement in aperture 33 by means of acap screw 53 which also secures pointer 54 to the top of base A. Annularcollars 55 are secured to feed screw 49 on either side of journalbearing I by tapered pins 58. Collars 55 are of lesser diameter thanaperture 35 for a purpose to be presently described.

Just beyond the outermost collar 55 feed screw 49 has a reduced portion51. A micrometer sleeve 58 adapted to cooperate with pointer 54 ismounted on feed screw 49 at this point by means of a set screw 59 and ahand wheel 8| is keyed to the outer end of feed screw 49 by a key 82 andretained in abutting engagement with micrometer sleeve 58 by aset screw83. Micrometer sleeve 58 may be properly set by hand merely by looseningset screw 59. From the foregoing description, it

is clear that feed screw 49, journal bearing 5| and their associatedparts are secured together to form a unitary assembly. As a consequenceand since collars 55 are of lesser diameter than aperture 35, thisassembly may be mounted in and removed from aperture 35 as a unit uponmanipulation of cap screw 53. l

'As heretofore pointed out aperture 35 is offset from slot 33. Itfollows, therefore, that cross aeeaass feed screw 49 will be similarlyoffset to protect j it from foreign matter that might fall upon itthrough slot 33. To operatively connect cross feed screw 49 and table B,an L-shaped bracket or cross slide nut 84 is secured to the underside ofbody portion 4| of table B by a pair of cap screws 85. Lock washers 58prevent inadvertent loosening of cap screws 85 in well known manner.Bracket 84 is attached to table B prior to the assembly of the table onbase A and is adapted to be inserted through slot 33 and notch 34 andthen moved over until the nut portion is aligned with aperture 35 ofbase A to be in position to receive feed screw 49. After table B isadjusted to the desired position alongslldes 38 by hand wheel 5|,micrometer sleeve 58 and feed screw 49, table B is locked in positionbysecuring gib lock cap screw 51. To give additional protection againstdust falling onto the screw a depending flange 33a is located at theedge of opening 33 adjacent the screw.

The upper surface of body portion 4| is of channel-like shape incross-section and provides upwardly 4extending legs 88 of substantialwidth.

. The 'uppersurfaces of legs 88 are machined to provide slides 89in acommon plane extending in a direction normal to slides 38.

Adjacent one leg .55, preferably the one toward front wall 25 of base A,there is provided a guideway 15l having a vertical wall 18 accuratelymachined to provide a surface for guiding table Cin a path normal to thepath of table B. vA gib 11 is adapted to be disposed in'guideway '15 inspaced relation to wall 15 and gib screws 18 and lock nuts 19 areprovided for moving gib 11 toward wall 18 and retaining it in itsadjusted after it has been set. It is to be understood that center stop92 is not assembled until table C has been mounted on table B, and thatit must be removed to permit disassembly of table C as will presentlyappear.

The front apron 48 at the end of table yB opposite the end provided withguide bar 43 has an aperture 88 formed in its front vertical wall andthe depending front wall 89 of body portion 4| is provided with analigned aperture 9| intersecting a vertical opening 92 formed in bodyportion 4| and guideway 15. Apertures 88 and 9| are provided withbearingsleeves 93 designed to journal pinion shaft 94 having pinion 95secured on one end by a tapered pin 95. As clearly seen in Figure 13,pinion 95 is received in opening 92 and its upper portion extends upinto guideway 15. A hand wheel 91 is keyed to the opposite end of shaft94 by a key 98 and is secured to the shaft by a set screw 99. The pinion95 in combination with means on table C to be presently described isadapted to movework table C back and forth to feed the work to thecutting tool.

Work-supporting table C comprises a body sec- 'tion v|0| having a raisedwork-supporting surface |02 provided with a longitudinally extending T-slot |03 in well known manner. Longitudinally extending extensions oraprons |04 are provided on the ends of body section I0| for a purpose tobe presently pointed out. 'I'he underside of body section |0I has acentral longitudinally extending web |05 interconnect-,ingenti walls|06. At longipositioned in predetermined relation parallel to,

wall 16 of table B by the vertical walls of notches Cap screws passingthrough apertures |09 and having their heads received in countersunkopenings l I2 in the top of table C retain rack position in the mannerpreviously described in bar ||0 in assembled relation in notches |08. Toassure proper positioning of rack bar ||0 in notches |08, screws havesufficientplay in apertures |09 to permit slight sidewise movement ofrack bar ||0 in notches |08.

The rack bar ||0 extends downwardly into guideway 15 of table C intoengagement with pinion and one vertical side wall is longitudinallygrooved at ||3 and designed to slidingly engage wall 15 of table B toguide table C in its movement on table B. To assure proper contactbetween rack bar ||0 and wall 16, gib 11 is forced into contact with theother wall ||4 of rack bar ||0.

Lubrication of the slides is preferably provided as seen in Figure 13,by providing the work table with a pair of vertical oil ducts 1|, whichopen out onto slides 59 ofthe sub-table and carry wicks 12 at theirlower ends, for evenly and slowly feeding oil to the slide surfaces. Oilmay be introduced through dust-proof oiler fittings 13. While only oneoiler assemblyV is shown in Figure 13, it is to -be understood that anexactly similar one is associated with the other slide 59 at the otherside of the table. It has been found that this will effectively oil thedevice and it possesses the further advantage that fresh oil flowingdown onto the slides tends to wash away any dustladen oil and keep theslide surfaces clean.

As clearly seen in Figure A13, groove |I3 of rack bar ll'has its lowerhorizontally extendflange formed on table ing wallslightly below theplane of'an upstanding, centrally disposed, longitudinally-ertending Bbetween legs 55. Flangetlat sp ed points alos its lengtlnis providedwith threade receive screws IT which ure-.washers portion o'fthelrperipheral. ng into g\roove ||3i but spaced from the top and bottomwalls thereof. Washers H5, accordingly, prevent table C frmbeing lifted95, and thereby prevent assembly and disassembly or tables B ent-1 cexcept by relative ending movement along guideway and slides 59. so,

they make it possible for table C to be moved into 15 |41 ble c en itsfront vertical wen m le previded with spaced apart stop rod holders |23lo ins a keyway surilciently to disengage rack fbar ||5 from pinionassenso y a notch |45 designed to receive the upper end of guide bar |31to definitely locate cap |43 in predetermined angular relation to theupper end of `column D; Cap |43 is also secured in place by -bolt |35and nut |42 and is provided with an offset ear |45 `designed to receiveraising screw \\-|41 for raising and lowering slide member E. As

clearly seen in Figure 5, raising screw |41 at its upper end has anunthreaded portion |45 hav- |49 for receiving a key |5|, A hand wheel|52 is mounted on the extreme end of the unthreaded portion |43 and isprovided `with a keyway |53 designed to cooperate with key |5| toconnect hand wheel |52 and raising screw through hub |55 of hand wheel|52 prevents axial displacement of hand wheel |52 and raising screwImmediately below and in contact with the hub |55 of hand wheel |52screw` |41 is provided with an annular collar |55 secured to screw |41by a tapered pin |51 and a fibre washer |58 is slid into designed toreceive a stop rod |24. Stop rod \eengagement with the opposite end ofVcollar |55.

. holders |23 are secured to table C by set screws (not shown) threadedinto apertures |25 in the top of taible C. Set screws (not shown) arealso threaded into the ends' of stop rod holders |23 to secure stop rod|24 in place. Stop rodblocks |25, in the form of split C-clamps, areadjustably secured on stop rod |24 by means of clamp bolts |21. Thesestop blocks cooperate with screw 85 and may be adjusted along bar |24 tostop the table in any position desired.

The work-supporting surface |02 of table C as heretofore pointed out isprovided with the conventionalT-slot |53. -A work-piece may, therefore,be secured to surface |02 by any of the conventional T-boit clampdevices or, if desired, a universal vise or other special work holdingor supporting device may be secured to surface l|02 by means of T-slot|03. In addition surface |52 is also designed to receive a conventionalmagnetic chuck such as the Brown andSharpe magnetic chuck which is shownin dot and dashlines in Figures 3 and 4.

Column D which supports frame F is provided lower end |3| and is groundalong its length and vided with webs |34 having central bores |35 formedtherein for a purpose to be presently pointed out.

As clearly seen in Figure 4, end |3| is disposed in bore 3| of base Awith the lower face |32 of nange in contact with the machined surface 33of land 23. Along one side column D isprovided with a longitudinallyextending groove |35 which is adapted to receive guide bar |31. Screws|33 secure guide bar |31. in groove |35 and the' groove and guide barare accurately located to assure the positioning of guide bar |31vertically and at right angles to land 25 and tables B and C.

A threaded shaft |43 extends upwardly through apertm'es |35 in webs |34andat its lower end is provided with a threaded plate |33 having `aplurality of upwardly facing lugs |4| designed to engage notches 30a ofboss 30 and prevent rotation ofshaft |33 when nut |42 is applied at thetop. As clearly seen in Figures 3 and 4 the upper end of column D isprovided with` a cap |43 having a depending annular flange |44containing 15 sleeve |14 at'its lower end is provided with with anexternal annular flange |33 adjacent its on the upper and lower faces|32 of flange |33 tov A assure a perfect right angular relation betweenits 5 annular slide surface |32 and faces |32 of danse `|33. Column D ishollow and at its ends is pro- The lower end of screw |41 is then passedthrough aperture-|59 of ear |45 and a collar |55 is secured to screw |41just below and in contact with the undersurface of ear |45. A pin |51secures the last mentioned collar |55 to screw |41. From the foregoingdescription, it will be seen that o screw u1 is rotatably mounted in eerus but n.

held against axial movement by collars |55 and that the weight of thescrew |41, hand wheel |52 and its associated mechanism is supported byear |45. Washer |55. however, takes the wear in- 35 cident to rotationof screw |41 and may be readily replaced when worn. As a consequence,there is no appreciable wear on the upper surface 'of ear |45.

' It will be clear from the preceding description that column D isaccurately mounted on base A and that no further fitting of the columnis required. As a consequence, the further fitting operations requiredon the conventional planed and scraped V-way columns is whollyeiiminated.

As previously pointed out, column D supports slide member E for slidingmovement therealong.

. To this-end slide member E comprises a sleevelike body member |5|split axially at |52 and having spaced bosses |53 adjacent its upper andlower ends. The inner wall of member |5| oppo- .site axial split |52 isprovided with an axially extending guideway |54 designed to receiveguide bar |31.. As clearly shown in Figure 2..the wall of member |5|adjacent guideway |54 is substan- 55 nelly .thicker et les to providefor the gmdeway and at spaced points adjacent the top and bottom of thisthickened area flats |55 are formed to lprovide nut bearing surfaces.Threaded apertures |51 interconnect flats |53 and guideway |54 and aredesigned to receive gib screws |53 which are adaptedto be locked inadjusted position by nuts |55. A gib |1| is adapted toflt into guideway|54 against guide bar' |31. Tightening of gib screws |53 forces gib |1|toward' wall |12 35 of guideway '|54 and draws wall |12 into intimatesliding engagement with guide bar |31 throughout its length to assuremovement of slide member ^|5| in a true vertical path along column D.

This sliding movement of member |5| is effected by raising screw |41which is threadedly oonnected to ear |13 of member |5| by means of athreaded sleeve |14 adapted to closely fit aperture |15 of ear |13. Asclearly shown in Figure l for unitary rotation. A set screw |54passing`\ spindle housing |99.

an annular shoulder |16. Sleeve |14 is assembled in aperture |15 fromthe bottom of ear |13 so that shouldery |16 contacts the bottom surfaceof -ear |13. A set screw |11 threaded into ear |13 face of ear |13 tolift member |6|. Since this liftingforce. is applied at one pointaroundthe periphery of 'member |6| there is a tendency to tilt member Eon'column D. To assure accurate rmovement along column D any loosenessbetween member E and `column D must be eliminated. This is accomplishedin the present invention by drawing the split member |6| snugly aroundcolumn D by means of nut |18 on stud |19 which passes freely throughaperture 8| in one of the lowerbosses |63 and is threaded into the otherboss |63. It is to be understoodthat nut |18 is tightened only to theextent necessary to secure a snug sliding fit between member E andcolumn D. After the desired fit is secured nut` |18 is locked in itsadjusted position by lock nut |82 and the desired sliding fit ispermanently maintained forl all future normal grinding operations.

Means is also provided for locking member E in any desired adjustedposition along column D.

To this end, a stud |83 passes freely through` aperture |84 in one ofthe upper bosses |63 and is threaded into the other boss |63. A threadedsleeve |85 having an annular flange |86 is threaded on the protrudingend of stud |83 until face |86 firmly engages the surface of boss |63.The body of sleeve |85 is provided with an annular flutedvshoulcler |81adapted to cooperatively engage internal uting |88 provided in the bodyof a handle. |89 which is secured to sleeve |85 by machine screw andwasher assembly 9|. Assuming that member E has been brought to thedesired position along column D by operation of hand wheel |52 and screw|41, handle |89 is rotated to draw the upper portion vof member ||i|tightly around column D whereupon member E is locked in its adjustedposition. It will'be appreciated that this coarse adjustment of member Elocates motor supporting and spindle housing frame F in predeterminedrelation to worksupporting table C since frame F, as previously pointedout, is carried by member E.

While frame F can be secured to member E in anydesired manner withoutaffecting theoperaf.

non omhe tables B and C and slidemember-E, it is a preferred feature ofthis invention topivotally mountframe F on slide member E. To

accomplish this desired result, body |6| of member E is provided withintegrally formed, axially aligned bosses |93 having aligned conicalrecesses' |94 in their ends.

Recesses |94 are de" signed to receive the conical ends of hardened'pivot'screws |95 which are threaded into thev side bars |96y of frame F.Lock nuts |91 secureY screws |95 against accidental displacement ofpivot screws |95. `As clearly shown in Figures 2.

and 6, side bars |96"pass'along opposite sides of member |6| and at oneend merge into a motor` mounting base |98 and at the otherv end intoa Anelectric motor 20| of '2li vand'spindle @sliding movement between button2.| and. the

tured ears 203 adapted to receive cap screws 204 forsecuring a motorhousing 20,5 (Figure 1) to An opening 206 inthe end of motor A housing205 is provided to receive. motor., switch l base |98.

201 of any suitable construction. The motor housingA 205 extends alongone side ofV column D and covers'side bar |96 of frame Fand its end 208is formed to correspondy in shape to the pe-4 l ripheraloutline ofspindle'housing |99Which it almost contacts.

Spindle housing |99 approximately midway between its ends is providedwith an-upstanding threaded Aboss 209 adapted to receive a hardenedmicrometer screw abutment button 2|| in the Y abutment screw2|3adaptedto cooperate with button 2|| is adjustably mounted -in lan arm2|4 integrally formed onmember |6|. As clearlyA seen in Figures 5 and 6,assembly 2| 2 lcomprises a bronze threaded sleeve or nut 2|5 havingaflange 2|6 and is carried in an aperture v2|1 formed in arm 2|4. Sleeve2|5 is separabl'e'from ear 2| 4 for Aease and1 cheapness of replacementand is assembled from the bottom of arm 2|44 and isy inserted inaperture 2| 1 with flange 2|6 abutting the under surface of arm 2|4.,` Aset screw 2|8 threaded into an edge of. arm 2d|4 ,se-,.f, cures sleeve2|5 against rotation in apertureZH, shoulder 2|6 accurately seating itwithin .the opening and preventingit fromv being pushedtherethrough. Anut'and washer assemblyfz'22l. locks the set `screw 2|8 in adjustedposition and also clamps a pointer 2| 9 -to arm 2|4.1y Abutment screw2|3- is threaded through sleeve. 2.*I5 into abutting contact with button2||, as shown in l. Figure 6. Adjacent its upper end, screw 2|3 isprovided with a groove 222 anda fiat 223. iA.

micrometer sleeve 224 isv securedto the screw by a set screw 225 seatingin groove' 222, with its downwardly extending, graduated fiange 226 en-`circling the upper portion of sleeveZ 5. A plastic hand knob 221 issecured on theupper endof screw 2|3 by means of a set screw 228, whichenI gages 'nat 223 and assures unitary rotation of I knob 221 and screw2 I 3.

Referring to Figure 6,1 itwinne seentnst the axis of button 2|| andmicrometer screw2l3'are in the vertical plane containing vthe axis ofspindle 229 mounted in housing.|99 and that Ythe'. abuty ment surface ofbutton 2| and the axis vof spindle` 229 are respectively equally spacedabove. .and j below the horizontal plane containing the axes ofpivot-screws |95. v-It will also be clear, from an.,

inspectioniof Figure' 3, that the -motor 2|l| is at a greater distancefrom pivot screwsv I 95 than hous-U ingV |99la'nd; spindle-.[1229 andthat, as a 'conse-f quence; "abutting engagement' of` button 2 I I :andylscrew.'2-|3isassured iat lall times by reason of theoverharg'lngfweightyoftrnotor 20|.' Becausel of, ithi'sgrelationship..rotation of,k nob 221 andthe.

"resultantaxialmovement of' screw 2|3will cause 4 asubstantiallyequalvertica'l movement of button l229 Awith, a relatively lnegligible fabutting end of lscrew 2`l3.

Since surface grmding wheel 230 is carried any suitable construction ismounted on base 98 by holddown bolts 202. The protruding end of base |98is-provided with a pair of spaced, aper- 'vention contemplates a novelmounting `merals 231 and 238.

l ing assemmy 25|.

spindle 229 which is in turn mounted'ln frame F carried by verticallyadjustable slide member E, it will be seen that very accurate verticaladjustment of the height of wheel `230 with respect to work-piecescarried by work table C can be readily effected by the construction ofthis invention. In'

ment is preferably aboutithree-eighths of an inch.

The micrometer adjustment, which is preferably graduated to .0005 inch,is then brought into play to make the final, ne adjustment for height bypivotal movement around pivot screws |95.

If desired, angular adjustment of Wheel 239 with respect to the path ofmovement of table C may also be readily eected by the improved columnstructure of this invention. In this connection, land 29 may be providedwith a zero mark, such as a notch 23| (Figure 15) for cooperation withappropriate angular graduations 232, including a zero point, formed onthe periphery of ilange |36, With notch 23| and the Zero point matching,the axis of rotation of grinding wheel 230 would be at right angles tothe path of movement of tableC as shown in the drawings. Such a settingis particularly desired for the usual surface grinding operations.However, if a different angular relationship were desired, the operatorneed only loosen nut |42 and rotate column D in aperture 3| until thedesired angular relationship is indicated by graduations 232 whereuponnut |42 would be tightened to lock column D in its adjusted position.

To gain the full benets of the accurate construction and adjustmentsheretofore pointed out, it is necessary to secure true rotation ofspindle 229 and wheel 230. To this end, the present infor spindle 229and wheel 230. \This novel mounting is shown in detail in Figures '1 to9 wherein housing |99 'at its opposite ends is provided with accuratelymachined bearing seats 235 and 236. 'I'he inner end of each of thesebearing seats is provided with an inwardly directed annular tlangerespectively designated by reference nu- Spindlen229 adjacent one end isprovided with a reduced section 239 forming a shoulder 24| Aconventional ball bearing 242 is mounted on section 239 with its innerlrace `clamped between shoulder 24| and a -nut and washer assembly 243threaded onto section 239.

The end 244 of spindle 229 beyond nut andwasher assembly 243 is stillfurther reduced and is adapted to receive a V-belt pulley wheel 245secured thereto in any conventional manner. A V-belt 246 connects pulleywheel 245 to a pulley wheel 241 carried by the shaft v249 of motor 20|to establish the driving connection for spindle 229. 'Ihe outer race ofbearing 242 is disposed in seat 235 in spaced relation to shoulder 231.While the outer race ts snugly enough to prevent relative rotationalmovement between it and seat 295,y

bearing 242 and spindle 229 are designed for unitary axial movementalong seat 235 for a purpose to be presently pointed out.

`Seat 236 is adapted to receive a tapered bear- Bearing assembly 25|comprises a tapered bearing sleeve 252 non-rotatably mounted'on areduced section 253/ of spindle 229,

movement without strain by a cap screw 251 projecting -through anopening in housing |99 and threaded into an opening 256 in sleev'e 256;a selfaligning bronze thrust washer 259 surrounding reduced section 253of spindle `229 and having its flat face containing radially extendinggrooves 260 in engagement with the larger end of sleeve 252 andprojecting radially beyond the periphery of the larger end of sleeve252; a split lock nut 26| threaded into the axially extending annularllange 262 of bearing Sleeve 256 with the conical bore in its endengaging the rounded end of thrust washer 259; and a locking screw 263threaded -into lock nut 26| to draw the split section together to locknut 26| to bearing sleeve 256 and having its end extending into anopening in thrust washer 259 to prevent rotation of the thrust washer.

Bearing assembly 25| is designed to eliminate ali end and radial play inspindle 229. This is accomplished, after the bearing parts are assembledwith respect to housing |99 and spindle 229 as shown in Figure '1,merely by loosening screw 263, engaging a spanner Wrench with notches264 of nut 26| and threading nut 26| into flange 262 of bearing sleeve256 thereby forcing thrust washer 259, inner tapered bearing sleeve 252and spindle 229 to the right in Figure? until the tapered bearingsurfaces of sleeves 252 and 256 are in proper hearing contact. Thismovement of spindle 229 is readily permitted due to the sliding relationbetween seat 235 and the outer race of bearing 242. In making thisadjustment care should be exercised to avoid jamming the bearing sleeves252 and 256 to such an extent that proper bearing action cannot takeplace.

While bearing assembly 25| may be lubricated in any suitable manner, thepresent invention provides a. novellubrication system wherein therotation of the spindle 229 and bearing sleeve 252 assures properlubrication. In this connection, housing |99 has a substantiallyrectangular formation 266 on its under surface adjacent the inner end ofbearing assembly 25|. 'I'his formation provides an oil reservoir 261adapted to be supplied with oil through an oil cup 268. Bearing sleeve256 is provided with an approximately semi-circular notch 269 extendingfrom the top to a point slightly below the axis of spindle 229 on eachside and a slinger ring 21| is disposed in notch 269 so as to rest onthe tapered surface of bearing sleeve 252 and dip into the oil lnreservoir |61. Notch 269 is of sulclent width to permit free rotation ofring 21| due to its 'contact with sleeve 252. An oil return duct 212,sloping toward reservoir 261 is formed in bear# ,ing sleeve 256 andinterconnects an'annular chamber 213 formed between the larger end ofbearing sleeve 252 and nut 26|. In operation,

slinger ring 21| supplies oil to the tapered surface of bearing sleeve252, and the centrifugal force due to rotation of sleeve 252, and alsoby reason of a groove 2,54 inthe tapered bearing, the

'oil is fed'along the tapered surface toward thev in contact with washer26|, and then passes y wheel 230 on spindle 229, the present invention lcontemplates a /mounting assembly that will permit removal andreplacement of the grinding wheel with full assurance that the/grindingWheel y will run true 'when replaced. As a consequence,

the present practice of dressing a wheel every time it removed andreplaced is obviated.

This novel mounting means comprises an adapter 216 having spaced,tapered spindle engaging portions 211 adapted to engage tapered section215 of spindle 229 and a radially extending annular flange 218 having anaxially extending rimr 219 formed at one end,l and designed to engage aside face of surface wheel 230. The opposite end of adapter 216 isexternally threaded at 282 and extends axially beyond the end of spindle229 a slight distance as clearly shown in Figure 7. A'n outer wheel ange283, having an axially extending rim 284 in alignment with rim 219'ofadapter 216, fits over the adapter and secures surface wheel 230 on thehub of adapter 216 with rims 219 and 284 in clamping engagement with theside faces of wheel 230, and is secured in place by a nut 285 threadedon the end of the adapter.

Adapter 216 is retained on spindle 229 by means of a headless set screw286 secured inthe end of spindle 229 and a spindle nuty 281 threaded onsaid set screw and seats in "an annular recess 288 in adapter 216 withits face in engagement with a radially disposed annular shoulder y 289formed at the inner end of recess 288. Re-

moval of wheel 230 and adapter 216 as a unit is readily effected bymerely removing lock nut 281.

It will be appreciated that no matter how many times this wheel assemblyis removed and replaced the relationship between the wheel 230 undadapter 216 is never disturbed and that the spaced sloping spindleengaging portions 211 of adapter 216 will act as self-aligning andlocating means to position adapter 216 and wheel 230 on the tapered endof spindle 229.

While in the construction previously described the essential workingparts of the improved grinder of the present invention enable anoperator to perform the desired work with extreme accuracy, the presentinvention also contemplates a novel belt guard 29| and a plurality ofwheel guards for use with different types of wheels. Belt guard 29|, asshown in Figures 2 to 4, comprises a belt guard casting 292 ofsubstantially dished form having apertures 293, 294

and 295 to respectively receive lthe motor shaft 248, pivot screw |95and its nut |91 and the end 244 of spindle 229y and the bearing securingnutv Guard casting 292/is'securedto an up-v 243. standing post 296integrally formed on frame F and to the end of spindle housing |99 at296e by' capscrews ,291, one of which passes through van arcuate slot298 (Figure 3) formed in casting housing lj to clear the teit. andpulleys of the7 grinder. l

Referring to Figure 2, it will be seen thatthe innerlsurface of guardcasting 292 around slot 298 and adjacent the end rof spindle housing-|99is thickened to provide inwardly extending bosses 299 to reinforce theguard casting at these points so that the entire weight of the guard maybe eiiiciently supported by the two cap screws 291. Guard casting 292 isalso provided with spaced,

threaded bosses 30| adapted to receive studs 302. i Studs 302 aredesigned to support a cover 303 of I dished form having stud receivingapertures 304` Y and having its peripheral wall 305 in overlappingrelation to peripheral wall 306 of guardcastin'g 292 thus avoiding thenecessity `of machining abutting surfaces of the guard casting andcover.

Thumb nuts 301 threaded on therprotruding ends ,of studs 302 securecover 303 to .guard'casting 292. Several stop 1ugs303a inside cover 303en# gage the edge of `guard casting 2924 and main-J tainy the two inproper spaced relationship.

A'wheel guard 308 adapted forguse with a surf face wheel such as 230 isillustrated in Figures 1 to 4 and 7 of the drawings. vGuard 306 isinostwclearly shown in Figures 2 and'lwlierein itis seen that the guard ismade up of a dish-shaped casting 309 secured to the endof spindlehousing |99 by cap screws 3|0 threaded intoyaperturesA 3| and adish-shaped cover VSI2. Cover 3|2y as clearly seen in Figures 2 and 3 issecured to caste ing 309 at one end by means of a swivel pin 3|3 havinga head 3|4. lSwivel pin` 3,|3 has a swivelling i'lt in ear 3| 5 of,cover 3|\2 and" is secured in aligned ear 3|6 of casting`309by ymeans,of a

set screw (not shown). At itso'ther end ear 3|5 of cover 3|2 is providedwith a arcuate s1ot'3|1,f1 designed to freely receive ,thejsha'nk cfathumb/.1 I nut 3|8 threaded onto a stud secured tov castingr f 309. Thehead of thumb nut 3'I'Bf'ifs ydesigned to engag the face of ear 3|6rwhenitistightened 'Y so as to clamp cover 3|2 in its closedposition. It

will be obvious Vthatrernoval fof wheel "230 or l tightening of, nut 265or spindle screw 286 may beV readily accomplished by merely looseningthumb screw 3 8 and rotating cover 3 2 upwardly around swivel pin 3|3 sol as to expose the interior of guard 308.

308 and'this pivotal movement of cover 3| 2 can Y be accomplishedwitliout interference or removal cf ,any parts and eliminates thenecessity of machining surfaces of cover 3|2 for abutting en-M` gagementwith casting 309. As clearly seen in FigureZ, swivel pin 3|3 is tappedat 323 adapt--t ing it for the mounting of a conventional surfacealignment indicator (not shown).

The various grinding wheels, such as surface wheel 230 `and cup wheels(not shown), may be dressed after assembly on spindle 229 by use of thenovel dressing xture 35|' of this invention.l

Referring to Figure 14, lnxture"35l\ comprises?.`

block 352 having,a notch 353 cut'in one corner;

to provide right'angularly disposedy ilang`es'354;y

. and 355. Eachof these angesis provided a bolt receiving slot 356andthe side faces `of the block 352' containing slots 356 areHaccu-.p

rately machined at right angles to assure proper seating onwork-,supporting surface A|0-2.,\The end of block 352 oppositeth'e endcontaining notch 353 is provided with a `slanting. circular 292. Arcuateslot 29.8 permits ready adjustment of casting 292 around the screw 291in spindle dpening 351 adapted to receive a dressing .tool

358 and support it in .proper positionfor dress- Since peripheral wall32| 4of coverf `3|2 pverlaps peripheral wall 322 of casting 309, sparksare prevented'from coming through guard` ing. A set screw 358 threaded`into a. threaded bore llsecures tool I! in block 352.

In using nxture 3.5i for dressingl surface wheels, table C is locked bybringing both stops up. aga-inst stop screw 85. Fixture 35i ispositioned on surface l2 of table\ C as shown in Figure 14 with thedressing toolin front of the vertical center line through the Wheel. AT-bolt and nut assembly 36!` fitting in T-slot |03 of table C and slot358 of flange locks fixture 35| in its adjusted position. With the tableC locked and fixture. 351 secured to surface i112 of table C as justdescribed, motorv 211| is started and hand wheel 6I is operated totraverse the table causing tool 358 to pass across the edge of wheel 230to effect the desired dressing.

aselaass lx secured to said base and having a portion engaging saidcircular land; a, grinding wheel and a driving mechanism thereformounted on said l column; a traversingT vtable having parallel surfacesengaging said longitudinal lands and sliding said table for rectilinearmovement along said longitudinallyextending lands: and a work- Y l0supporting table mounted on saidy traversing vtable In dressing cupwheels, xture 35i,l is secured to surface 102 with flange 355 inengagement with surface H2 and tool 358 lin a horizontal position andslanting toward the right hand end, of

table C as. viewed in Figure 2|.' Tool 358 is dis`- posed'in front ofthe vertical center line of the wheel as in the grinding of surfacewheels and both tables are locked. The wheell is 'fed up and down acrosstool 358 by means of hand Wheel l 52 Itv will beappreciated, therefore,that by the use of this simple fixture proper dressing of surface andcupwheels mountedlon spindle 229 can be readily effected.

Arm 2M is also adapted bracket 31| (Figure 1). Bracket 311 is secured toarm 2H by means of capscrews (notshown) threaded into apertures 312 andis provided with an arm 313 which in turn carries a light 314 at the endofla flexible supporting tube .315.' An

adjustable shade 316 is provided to shield the light from the operatorseyes. Due to the flexibility of tube 315 and thev adjustable shade 31S,light 314 may bepositioned inanydesired position to assure, adequateillumination of the work without shiningin the eyes of the operator, andis adjustable up and down with slide E. Since this light assemblyisfdisclosed and claimed ina co-pending application and does not form apart of the present inventionfit will not be further described. i

While we have disclosed the\invention as being applied to'a surfacegrinder, it is not limited to such use and may be employed with variousattachmentsv to carry out a wide variety of grinding loperations. Forinstance, a universal vise may be attached to the table and chip breakergrinding carried out, or `an attachment for mounting tools or cuttersbetweencenters may be mounted) on the table if desired,` and attachmentsof this character, including modified wheel guards to accommodatevarious types of grind-.- ing wheels. form the subject matter of furtherapplications about to be filed by us.

'I'he invention may be embodied in other specic formsv without departingfrom the spirit or essential characteristics thereof. `The present-embodiments are therefore to be considered in all respects asillustrative and notrestrictive, the scope of the invention beingindicatedby the ap- A pended claims rather than by the *foregoing detoreceive a llight for sliding movement thereon transverselytcisaidtraversing table, for feeding a work-'piece v.

toward and away from said wheel. t Y v 2 Thercombination defmedin claim1,'where- 'in the traversing table is provided with spaced; upstanding.:longitudinally extending lands'dis-v posed at "rightl angles tothe-longitudinally ex-` tendingplandsjofsaid base and saidwork-supporting table is'ladapted t'o s lide thereon. 3. The combinationdefined inclaim 1, wherein said base 'is provided with 'an apertureconcentricall-y disposed 'with respect to said circular1 land.

and said column has a formation at its lower end extending into saidaperture, whereby the 'column is mounted onv said basefor swivellingmovementin said aperture in bearing engagement with said circular land.Q l

4. In a machine tool, a base-having a pair of parallel yflat surfacedhorizontal `guides and a parallel flat surfaced vertical guide; a tablemounted on said base and having mating surfaces slidably coacting withsaid guides; means for causing "said table to slide over said horizontalguides ina direction exactly parallel to said vertical guide, comprisinga gib mounted on said base and engaging a vertical surface onsaidlytable paralleling said vertical surface on saidzsbase; and meansfor maintaining said gib in engagement with said vertical surface.

5. The machineV tool delned'in claim ff, togetherwith means for forcingsaid gib into frictional locking engagement with said vertical sur--face on said table, for locking said table to said base.

6. In a machine tool,l a support for mounting a table for slidingmovement in a horizontal plane, comprising spaced, upstanding,longitudinally extending lands formed on the support and having theirupper surfaces ground to provide slides disposed in a common plane; aguideway formed in one of said lands and extending from end to endthereof and having at least one of its side walls accurately formed toguide said table along the desired path; a traversing table havingdepending, longitudinally extending lands formed thereon with theirlower surfaces ground to provide slides disposed in a common plane andadapted to slidingly cooperate with said first-mentioned slides', aguide bar on one of the depending lands of said table adapted to fitfreely into said guideway, with one of its side faces 'in slidingengagement with said one side wall, a gib disposed between said other ofsaid side walls and saidguide bar; and means l engaging said gib andforcing it into sufficiently snug sliding relationship with the other ofsaid side faces to cause said guide bar to bear against said one sidewall throughout its length whereby said table is forced to move in apath determined by the surface of said one of said side walls.

'1. In a machine tool, a base having spaced. upstanding, longitudinallyextending, parallel dands forming `slides disposed in a 4common plane; aguideway in one of said lands extending from end to end thereof in adirection parallel to said lands and having atleast one verticallyextending wall; a traversing table having spaced, depending, parallellands on its under face forming slides disposed in a common planeadapted to respectively cooperate with the slides of said base; a guidebar removably secured to one of said depending lands and designed toextend into said guideway and slidingly engage said one verticallyextending, parallel wall; a gib disposed in said guideway between saidother Wall and said guide bar; means for forcing said gib into contactwith said guide bar to cause said guide bar to bear against said one ofsaid side walls throughout its entire length, whereby said traversingtable is constrained to move along a path determined by said onevertically extending, parallel wall; means carried by said base formoving saidtraversing table inboth directions along said path; saidtraversing table also having spaced, upstanding, parallel lands on itsupper face extending at right angles to said depending lands formingslides disposed in a common plane parallel to said last-mentionedslides; a guideway in one of said second-mentioned spaced, upstanding,parallel lands and having at v least one vertically extending wallparallel to the axes thereof; a work table having spaced, depending,parallel lands on its under face forming slides disposed in a commonplane adapted to respectively cooperate with the slides formed by saidupstanding lands of said traversing table and having a work-supportingsurface disposed in a plane parallel to said last-mentioned slides; aguide bar removably secured to one of said last-mentioned dependinglands and designed to extend into said last-mentioned guideway andslidingly engage said last-mentioned one vertically extending, parallelwall; a gib disposed in said last-mentioned guideway between said otherwall and said last-mentioned guide bar; means acting upon saidlast-mentioned gib for causing said last-mentioned guide bar to bearagainst said one of said side walls throughout its entire length,whereby said work table is constrained` to move along a path determinedby said lastmentioned one vertically extending, parallel wall; meanscarried by said traversing table for moving said work table in bothdirections along said last-mentioned path; said guides and Endescooperating to provide a T-square table assembly wherein the tables areconstrained to move in paths at right angles to each other and said worksurface moves in ra plane parallel to the common plane determined by theslides formed on the base.

8. 'I'he combination dened in claim '7, wherein said last-mentionedguide bar is provided with a `longitudinally extending upwardly facingguide face and at least one guide device is carried by said traversingtable and cooperates with said guide face to prevent tilting of saidwork table when moved to its extreme1 positions with work thereon whosecenter of gravity lies' outside the table surface.

9. A base and traversing table assembly for use in grinders orlike/machine tools, comprising a base having spaced parallel guidingmeans and a, slot between said guiding means disposed engaging saidcrosswisel adjustment screw; and means for actuating said crosswiseadjustment screw, for moving said traversing table along said guidingmeans.

10. In a machine tool, a base; a table mounted for sliding movement onsaid base, a feed screw for moving said table over said base mounted forrotation in a bearing sleeve snugly seating in an opening in said base;means on said screw for limiting endwise movement thereof with respectto said bearing sleeve and being of sufficiently small diameter to passthrough said opening in said base, and means for releasably locking saidbearing sleeve in said opening.

11. A table adjustment screw assembly for use in grinders or likemachine tools comprising a shaft designed to support the adjustmentscrew assembly for installation as a unit and having a feed screwportion extending from one end to a point intermediate Lits ends, a stopcollar secured to said shaft at a point beyond said feed screw portion;a bearing collar, rotatably mount-` ed on said shaft, and having adiameter slightly larger than said stop collar, with one end disposed inabutting relation to said stop collar: an outwardly extending annularflange on the other end. of said bearingcollar adapted to locate saidbearing collar in a supporting seat; a second stop collar secured tosaid shaftin abutting engagement with said other end of said bearingcollar; a stop screw threaded into said bearing collar intermediate itsends for locking said bearing collar against rotational and axialmovement in its supporting seat; an adjustment screw dial secured tosaid shaft and having a pocket in one end for receiving said `secondstop collar and.

providing a peripheral flange adapted to cooperate with indicia means`to provide a micrometer gauge for adjusting said feed screw; and a handsubstantially parallel thereto; a crosswise ad-v wheel secured to saidshf'aft.

12. In a grinder, a base; means on said base adapted to support aiWork-piece; a vertical column mounted on salid base; a slide membermounted for vertical sliding movement on said column and supporting agrinding wheel and its,

driving mechanism; means for locking said slide member to said column atanyl desired level; and eans for accurately guiding said slide member inits vertical sliding movement comprising -a vertical guide bar removablysecured to said column and having accurately formed vertical side faces;a cooperating guideway formed in said fslide member having an accuratelyformed vertically extending side wall slidingly engaging one 'side faceot said guide bar; a gib' disposed between the other side face of saidguide bar and the other side wall of said guideway; and means foradjustably forcing said `gib into snug sliding cooperation with said.other side face and for 'locking/said gib in djusted position. toconstrain said slide member for vertical sliding movement in a pathdeterminedby said one vertical side face.

13./The combination dened in claim l2,

" wher n said base is also provided with an aperture `snugly receivingthe lower end of said column.;` and anfarea of the upper surface ofsaidbase around said aperture is accurately formed to provide an annularseating surface tightly engaging an annular Vflange on said column, forsupporting thelatter in a true vertical plane, and means, including abolt extending upwardly through said column, for locking said columnagainst axial and rotational movement on-said base. j

14. A support for a grinding wheel or similar machine tool and itsdriving mechanism, comprising a base; a column supported on said basewith its axis in a plane normal to the plane of the base; a slide membersupported on said column for axial sliding movement along said column; acap mounted on the upper end of said column: means interconnecting saidslide member and said cap for moving said slide member along said co1-umn; a frame supported on said slide member and adapted to support agrinding wheel and its driving mechanism; and common means foraccurately locating said cap and slide member in predetermined angularrelationship to each other and also with respect to said column,comprising a guide bar secured to said column and slidably engaging saidslide member and fitting into a recess in said cap.

15. The combination dened in claim 14, wherein said slide member has agroove freely `receiving said guide bar and said groove has at least oneaccurately formed side wall engaging a face of said guide bar andproviding a space for receiving a gib between its other Wall and saidother face of said guide bar, and means is provided for forcing said gibtoward said guide bar, for constraining said slide member for slidingmovement along said column in a path determined by said guide bar.

16. In a grinding machine having a horizontally movable Work table, averticalvcolumn at one side of said work table, and grinding mechanismsupported on said column for vertical movement; a mechanism supportingslide member surrounding` said column and vertically split along oneside to render it circumferentially contractible and expansible;adjustable means on said slide member operative to adjust the size ofsaid member to provide a close sliding fit with said column andcompensate for wear between said column and slide member; means forlocking said adjustable means in adjusted position; and manuallyoperable means also carried by said slide member operative to lock saidslide member in any desired position along said column against movementrelative to said column.

1'7. In a grinding machine having a horizontally movable work table, avertical column at one side of said work table, and grinding mechanismsupported on said column for vertical movement in a path normal to theplane of said work table; a slide member, vertically split along oneside from end to end to render it circumferentially contractible andexpansive, surrounding said column and supporting said grindingmechanism; adjustable means on said slide member adjacent one end ofsaid split for contracting said slide member to provide a close slidingfit with said column and compensate for wear between said column andslide member thereby accuring movement of said grinding mechanism in apath normal to said plane of said work table; locking means forretaining said adjustable means in adjusted position; and a manuallyoperable means also carried by said slide member and disposed adjacentthe other end of said split for 'further contracting Vat least a'portion of said slide member to lock it in the desired position alongsaid column against movement relative to said column.

18. In` a machine tool, a support; a frame mounted for rocking movementabout a substantially horizontal axis on said support; a tool spindlejournalled on said support for rotation about I an axis parallel to saidhorizontal axis; an arm on said support overlying said spindle; anadjusting screw threaded into said arm and engaging said frame at apoint substantially in vertical alignment with said spindle and on anarc having said horizontal axis as a center and passing substantiallythrough the axis of said spindle whereby said frame may be rocked toadvance said tool towardthe work with a minimum of sliding between saidscrew and the frame thereby effecting a substantially equal verticalmovement of said tool spindle and said adjusting screw to- Ward the Workupon actuation of said adjusting SCTBW.

CHRISTY A. WIKEN. ERIC A. REIBIG.

